This page contains complete schematics and block diagrams documenting the system architecture, component interconnections, and design structure.

TODO: Add complete system block diagram

Please add a high-level system block diagram showing: - Arduino with BNO085 sensor connection - FPGA with dual SPI slave interfaces - STM32 MCU with SPI master interface - Data flow arrows indicating direction - Key signals (SPI lines, I2C lines, power, ground)

Recommended Image Specifications: - Format: PNG or SVG - Size: 1200px width minimum - Location: Save to Images/system-block-diagram.png - Include labels for all components and connections

Example placeholder:

![System Block Diagram](Images/system-block-diagram.png){width="100%" alt="Complete system block diagram showing Arduino, FPGA, and MCU connections"}

TODO: Add FPGA internal block diagram

Please add a detailed FPGA block diagram showing: - Top-level module (drum_trigger_top) - Arduino SPI slave module (arduino_spi_slave) - MCU SPI slave module (spi_slave_mcu) - Internal data paths and buffers - Control signals and state machines - Clock domains

Recommended Image Specifications: - Format: PNG or SVG - Size: 1200px width minimum - Location: Save to Images/fpga-block-diagram.png - Show module hierarchy and interconnections

Example placeholder:

![FPGA Block Diagram](Images/fpga-block-diagram.png){width="100%" alt="FPGA internal architecture showing SPI slave modules and data flow"}

TODO: Add MCU interface diagram

Please add a diagram showing: - STM32L432KC pin connections - SPI1 interface pins (PB3=SCK, PB5=MOSI, PB4=MISO, PA11=NSS) - Connection to FPGA - Power and ground connections - Any other peripheral connections

Recommended Image Specifications: - Format: PNG or SVG - Size: 1000px width minimum - Location: Save to Images/mcu-interface-diagram.png - Label all pins and their functions

Example placeholder:

![MCU Interface Diagram](Images/mcu-interface-diagram.png){width="100%" alt="STM32 MCU pin connections and SPI interface"}

TODO: Add Arduino sensor interface diagram

Please add a diagram showing: - Arduino/ESP32 connections - BNO085 sensor I2C interface (SDA, SCL) - Power connections (3.3V, GND) - SPI interface to FPGA (SCK, MOSI, CS) - Pin assignments

Recommended Image Specifications: - Format: PNG or SVG - Size: 1000px width minimum - Location: Save to Images/arduino-sensor-interface.png - Show both I2C (sensor) and SPI (FPGA) connections

Example placeholder:

![Arduino Sensor Interface](Images/arduino-sensor-interface.png){width="100%" alt="Arduino connections to BNO085 sensor and FPGA"}

TODO: Add complete pin connection diagram

Please add a comprehensive pin connection diagram showing: - All interconnections between Arduino, FPGA, and MCU - Signal names and pin numbers - Power and ground distribution - Any pull-up/pull-down resistors - Clock signals

Recommended Image Specifications: - Format: PNG or SVG - Size: 1400px width minimum - Location: Save to Images/pin-connections.png - Use color coding for different signal types (power, ground, SPI, I2C, etc.)

Example placeholder:

![Pin Connection Diagram](Images/pin-connections.png){width="100%" alt="Complete pin connection diagram for all components"}

TODO: Add SPI timing diagram

Please add a timing diagram showing: - SPI Mode 0 timing (CPOL=0, CPHA=0) - CS, SCK, MOSI, MISO waveforms - Data bit timing - Transaction boundaries - Example packet transmission

Recommended Image Specifications: - Format: PNG or SVG - Size: 1200px width minimum - Location: Save to Images/spi-timing-diagram.png - Show clock edges and data sampling points

Example placeholder:

![SPI Timing Diagram](Images/spi-timing-diagram.png){width="100%" alt="SPI Mode 0 timing diagram showing clock and data signals"}